april861
21.03.2020 •
Mathematics
Expand: In (4a)3
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Ответ:
12a
explanation: 3x4 is 12 so you just add the variable onto it because its multiplication
Ответ:
C)He should also take a sample from each of the other history classes in all of the other grades in the middle school.
Step-by-step explanation:
Not only students in the 8th grade are in the middle school, there are other students in other grades who are in the middle school and are enrolled in history classes. Leo's sample is only from one grade of the middle school. In fact, including Ms. Lopez's and Mrs. Frank's classes in the selection of sample is not sufficient. Leo has to take a sample from the remaining grades to avoid making a wrong conclusion as a result of bias in the choice of data.